ⓔノート12-4-2　APRI，FIB4–index

APRI (aspartate aminotransferase to platelet ratio index)

＝100×(AST値/AST正常上限値)/血小板数［10⁹/L］

FIB4–index (fibrosis index based on the four factors)

＝(年齢×AST［U/L］)/(血小板数［10⁹/L］×$\sqrt{\mathrm{ALT}}$［U/L］)

〔榎本信幸〕